Question

Two electric lamps are rated as 220 V, 100 W and 220 V, 4 W respectively. Their electric resistances are​

Answer 1

Answer:

Given,

Ratings of 1st electric lamp:-

Voltage = 220V

Power = 100W

To find:-

Resistance of each bulb

Ampere = Watts/Vlots

= 100/220

= 0.45Amp

Now resistance = Voltage / Current

= 220/0.45

= 488.889ohm

Ratings of 2nd electric lamp:-

Ampere = Watts/Vlots

= 4/220

= 0.018182

Now resistance = Voltage / Current

= 220/0.018182

= 12099.998ohm.

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